<h3>1.描述</h3>
<p>深色背景</p>
<h3>2.示例</h3>
<div style="background-color: #464c59; padding: 10px; width: 100px">
  <input type="radio" tiRadio name="group2" dark disabled="true" [(ngModel)]="selected" value="option1" label="选项1" /><br /><br />
  <input type="radio" tiRadio name="group2" dark disabled="true" [(ngModel)]="selected" value="option2" label="选项2" /><br /><br />
  <input type="radio" tiRadio name="group2" dark [(ngModel)]="selected" value="option3" label="选项3" /><br /><br />
  <input type="radio" tiRadio name="group2" dark [(ngModel)]="selected" value="option4" label="选项4" />
</div>
<br />
<br />
选中项：<span>{{selected}}</span>
